||07-09-2008 07:18 PM
Originally Posted by shimp
icynene is open cell and likely dissolve in 5 - 7 years
There are many types of foams on the market, and for general discussion, only the density and cells are used to determine what you are buying. Closed cell, 2lb. foam is really tight material, and rarely used to fill a wall cavity completely, due to cost, and effectiveness. Open cell foam is what used to be featured on the home shows where is was sprayed in the cavities and then shaved off flat. Not as effective, and I doubt anyone uses it now.
The closed cell provides a perfect air seal, and does not break down readily, even under UV exposure.
If you think this product isn't tough, just think about the bed liner in a pick-up truck....it is the same base chemical process without expansion, polyurea.
The down side to spray foam is cost. About double what we can do with sprayed cellulose, and before you even say it, cellulose does not "settle" in the wall cavities when applied correctly, it is glue set.